<!DOCTYPE html>
<html>
 <head>
 <meta charset="UTF-8">
    <meta -equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
 <title>来自丫丫的弹幕攻击</title>
 <style>
 *{
 margin:0;
 padding:0;
 }
 #wrap{
 width:800px;
 height:550px;
 background:#E9E8E8;
 margin:0 auto;
 position:relative;
 }
 #content{
 width:750px;
 height:400px;
 background:#fff;
 margin:0 auto;
 border-radius: 15px;
 position:relative;
 overflow:hidden;
 }
 input:nth-of-type(1){
 width:250px;
 height:30px;
 margin:20px 0 0 200px;  
 }
 input:nth-of-type(2){
 width:60px;
 height:33px;  
 }
 .p{
 height:30px;
 line-height:30px;
 position:absolute;
 top:0;
 left:770px;
 font-weight:900;
 font-size: 30px;
 }
 </style>
 </head>
 <body>
 <div id="wrap">
 <div id="content">
 </div>
 <input type="text" id="txt" placeholder="一起来吐槽吧~"/>
 <input type="button" value="发送" id="btn" />
 </div>
 <script src="Http://libs.baidu.com/jquery/1.9.1/jquery.js"></script>
 <script>
 $(function(){
 alert(navigator.connection);
 $("#btn").click(function(){
  var $value=$("#txt").val();
  var $p=$("<p></p>");
  $p.addClass("p");
  $p.text($value);
  $("#txt").val("");//点击过后设置文本框内容为空
  var _top=Math.floor(Math.random()*($("#content").innerHeight()-30));
  var _fontsize=16+Math.floor(Math.random()*10);
  var _rgb="rgb(" + Math.floor(Math.random()*255)+"," + Math.floor(Math.random()*255)+"," + Math.floor(Math.random()*255)+")"; 
  $p.css({"top":_top,"font-size":_fontsize,"color":_rgb});
  $("#content").append($p);
  var _timer=Math.ceil(Math.random()*5000)+10000;
  $p.stop().animate({"left":"-500px"},_timer,function(){
  $(this).remove();
  }); 
 });
 })
 </script>
 </body>
</html>